If you're in the market and have the cash Amazon has some amazing deals right now on battery backup systems (or "solar generators" if you will). Some of them are way cheaper than any DIY solutions I've found.
Discussion
Got some links?
Deal of the day: EF ECOFLOW Portable Power Station Delta 2, 1024Wh LiFePO4 (LFP) Battery, 1800W AC/100W USB-C Output, Solar Generator(Solar Panel Optional) for Home Backup Power, Camping & RVs
Thanks!
This one is 60% off and you can get the extra battery to double the capacity and its about $50 cheaper than buying the 2048 watt unit.
EF ECOFLOW Portable Power Station DELTA Max 2000, 2016Wh Expandable Capacity, 1.8H to Full Charge, Solar Generator for Home Backup, Emergency, Outdoor Camping(Solar Panel Optional) https://a.co/d/2xDQh26